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作者

来源

URBAN FORESTRY & URBAN GREENING,Vol.27,P.69-75

语言

英文

关键字

Fraxinus excelsior; Common ash; Ash dieback; Hymenoscyphus fraxineus; Pruning; PATHOGEN HYMENOSCYPHUS-PSEUDOALBIDUS; FRAXINUS-EXCELSIOR L.; CHALARA-FRAXINEA; FOREST PATHOGENS; SOUTHERN SWEDEN; CAUSAL AGENT; BLISTER RUST; COMMON ASH; MANAGEMENT; GROWTH

作者单位

[Marciulyniene, Diana] Lithuanian Res Ctr Agr & Forestry, Inst Forestry, Liepu Str 1, LT-53101 Girionys, Kaunas Distr, Lithuania. [Marciulyniene, Diana; Davydenko, Kateryna; Stenlid, Jan] Swedish Univ Agr Sci, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden. [Davydenko, Kateryna] Kharkiv State Zoovet Acad, Kharkov, Ukraine. [Cleary, Michelle] Swedish Univ Agr Sci, Southern Swedish Forest Res Ctr, Alnarp, Sweden. Marciulyniene, D (reprint author), Lithuanian Res Ctr Agr & Forestry, Inst Forestry, Liepu Str 1, LT-53101 Girionys, Kaunas Distr, Lithuania. E-Mail: Diana.Marciulyniene@mi.lt

摘要

Hymenoscyphus fraxineus causes a destructive invasive tree disease known as ash dieback threatening the survival of common ash not only in the forests, but also in urban and landscape settings. Pruning is a potential management practice that could help maintain tree vitality and aesthetics in parks, gardens, alleys and recreation areas, as well as maintaining veteran trees having high heritage or cultural value, or trees with high genetic importance (e.g. located in clonal seed orchards). In this study we investigated the maximum distance proximal to the lesion margin at which H. fraxineus can be detected on individual branches infected by the fungus in order to provide recommendations for pruning. Pruning of branches was carried out on 38 trees in southern Sweden. Tissue samples including bark and wood were collected from the margin of the lesion and at 5 cm intervals proximal to the lesion. Molecular analysis revealed presence of H. fraxineus in 91.3% of the investigated lesions. The proportion of lesions at which H. fraxineus could be detected declined with increasing distance from the lesion margin, with a significant reduction in the number of positive samples at 10 cm proximal to the margin. At 30 cm from the lesion edge the pathogen was never detected. Our results suggest that routine pruning may help maintain the vitality of younger trees. Pruning branches at least 35 cm from visible, active lesions in the bark should exclude the fungus and therefore reduce the probability of stem infection by H. fraxineus, however this cultural control tactic may only be economically feasible for high value amenity trees.